this situation could have happened.
OK, you are now saying that this did NOT in fact happen, you are just surmising.
if you assume that at nominal RPM the rotor can endure a maximum load factor of 2 to 3 at MTOW (ie a turn of 60 deg bank+)
then the rotor should be able to assume a reduction of centrifugal force of 2 to 3 at MTOW or almost 4 at MTOW-30% (a lightly loaded AC)
this translate into a reduction of RPM of 50% (square root of 4) not too far fetched.
Remember that a 60 degree bank turn is done at 100%RRPM, and the airspeed decays fairly rapidly because the power available is not sufficient to hold speed. Yes, the head can cope with 2.7g normally, at normal RRPM.
But let those revs decay to 40%, and you will find that you are not flying any more. The rigidity of the blades is vastly reduced, the blades will cone excessively, and Frank Robinson will be really annoyed. Yes, it is too far fetched.